This is the 779th most frequent Croatian word.
sina
"Sina" in Croatian means "son" in English.
In this sentence, 'sina' is in the accusative case, used to indicate the direct object of the preposition 'za'.
Ovaj poklon je za mog sina.
This gift is for my son.
Here, 'sinov' indicates possession, referring to something that belongs to the son.
Sinov maslac od kikirikija je na stolu.
The son's peanut butter is on the table.
In this instance, 'sina' is in its plural nominative form, used to enumerate the sons as objects owned or possessed.